You are wrong.
The reality is that a Black kid with a 3.2 likely is smarter and a harder worker than a white kid with a 3.7 GPA.
That is because the white kid likely has traveled, been tutored, had access to lots of books, computers, internet, etc.
And statistically Blacks are extremely disadvantaged in comparison.
And even if there was no inherent discrimination against the Blacks kid's educational preparation, it is still good to have affirmative action so that college students get enough exposure to other cultures and races.